/**
 * 属性赋值
 * */
 private void setModel(User user,Model model){
 long currentUserId = getUserId();
 long visitUserId = user.getId();
 //是否是自己
 boolean isSelf = currentUserId == visitUserId;
 //两个用户是否已经是好友
 boolean isFriend = groupService.isFriend(currentUserId,visitUserId);
 Map<String,Object> userMap = new HashMap<>(8);
 userMap.put("avatar",user.getAvatar());
 userMap.put("name",user.getUserName());
 userMap.put("addtime", TimeUtil.formatDate(user.getCreateAt())+" 加入");
 if(user.getSign()==null ||user.getSign().length()==0) {
  userMap.put("sign", "");
 }else {
  userMap.put("sign", "(" + user.getSign() + ")");
 }
 userMap.put("uid",user.getId());
 userMap.put("self",isSelf || isFriend);
 model.addAttribute("user",userMap);
 }

<div class="fly-home" style="background-image: url();">
 <input type="hidden" th:value="${user.uid}" id="visitUid"/>
 <img src="" th:src="${user.avatar}" th:alt="${user.name}"/>
 <h1>
  <p th:text="${user.name}"></p>
  <i class="iconfont icon-nan"></i>
 </h1>
 <p class="fly-home-info">
  <!--<i class="iconfont icon-zuichun" title="飞吻"></i><span style="color: #FF7200;">67206飞吻</span>-->
  <i class="iconfont icon-shijian"></i><span th:text="${user.addtime}"></span>
  <!--<i class="iconfont icon-chengshi"></i><span>来自杭州</span>-->
  <i class="iconfont icon-qq" th:if="${user.self==false}"></i><a lay-event="addFriend" href="#" rel="external nofollow" title="添加TA为好友" th:if="${user.self==false}">加为好友</a>
 </p>
 <p class="fly-home-sign" th:text="${user.sign}"></p>
 </div>

/**
 * 提交好友申请
 * */
 public JsonResult saveFriendApply(long toId,String remark){
 remark = HtmlUtils.htmlEscape(remark);
 ContextUser user = ShiroUtil.getCurrentUser();
 long userId = Long.parseLong(user.getUserid());
 int record = applyRepository.countByToidAndUidAndTypeAndResult(toId,userId,ApplyType.friend,0);
 if(record > 0){
  return JsonResult.fail("已经申请过");
 }
 Apply apply = new Apply();
 apply.setType(ApplyType.friend);
 apply.setToid(toId);
 apply.setRemark(remark);
 apply.setUid(userId);
 apply.setAvatar(user.getAvatar());
 apply.setName(user.getUsername());
 apply.setRead(false);
 apply.setResult(0);
 return saveApply(apply);
 }

/**
 * 获取starter
*/
private static LayimWebsocketStarter getStarter(){
 return (LayimWebsocketStarter)SpringUtil.getBean("layimWebsocketStarter");
 }

private static ServerGroupContext getServerGroupContext(){
 return getStarter().getServerGroupContext();
 }

/**
 * 获取channelContext
 * */
 private static ChannelContext getChannelContext(String toId) {
 ServerGroupContext context = getServerGroupContext();
 //找到用户
 ChannelContext channelContext = context.users.find(context, toId);
 return channelContext;
 }

/**
 * 服务端主动推送消息
 * */
 public static void pushApplyMessage(String toId) {
 logger.info("执行到了发送方法:pushApplyMessage");
 LayimToClientNoticeMsgBody body = new LayimToClientNoticeMsgBody();
 ChannelContext channelContext = getChannelContext(toId);
 //先判断是否在线，再去查询数据库，减少查询次数
 if (channelContext != null && !channelContext.isClosed()) {
  int count = getApplyService().getUnreadMsgCount(Long.parseLong(toId));
  body.setCount(count);
  push(channelContext, body);
 }
 } 
/**
 * 服务端主动推送消息
 * */
 private static void push(ChannelContext channelContext,Object msg) {
 try {
  WsResponse response = BodyConvert.getInstance().convertToTextResponse(msg);
  Aio.send(channelContext, response);
 }catch (IOException ex){
 }
 }

public class ApplyEvent extends ApplicationEvent {
 public ApplyEvent(Object source) {
 super(source);
 }
 private long toid;
 public long getToId(){
 return toid;
 }
 public ApplyEvent(Object source, long toId) {
 super(source);
 this.toid = toId;
 }
}

public class ApplyListener implements ApplicationListener<ApplyEvent> {
 private Logger logger = LoggerFactory.getLogger(ApplyListener.class);
 @Override
 public void onApplicationEvent(ApplyEvent applyEvent) {
 new Thread(){
  public void run(){
  Long toId = applyEvent.getToId();
  //这里就要调用上文中的推送了
  PushUtil.pushApplyMessage(toId.toString());
  }
 }.start();
 }
}

public static void main(String[] args) {
 SpringApplication springApplication = new SpringApplication(LayimApplication.class);
 /**
  * 这里监听增加listener，listener才会触发
  * ApplyListener 是监听好友申请的事件
  * */
 springApplication.addListeners(new ApplyListener());
 springApplication.run(args);
 }

/**
 * 好友申请
 * */
 @PostMapping(value = "/apply-friend")
 public JsonResult apply(@RequestParam("toid") Long toId,@RequestParam("remark") String remark){
 JsonResult result = applyService.saveFriendApply(toId, remark);
 //申请成功，发布申请事件，通知 toId处理消息，如果不在线，不会进行处理
 if(result.isSuccess()){
  applicationContext.publishEvent(new ApplyEvent("apply",toId));
 }
 return result;
 }